Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 285aeb7be25058b4…

MALICIOUS

Office (OLE) / .XLS

4.32 MB Created: 2013-08-30 14:29:57 Authoring application: Microsoft Excel First seen: 2023-08-05
MD5: 504ae0911586df80721873efcd8fee16 SHA-1: 2cb9d3d72fb2ed4dd7d69774f9132df013b7e270 SHA-256: 285aeb7be25058b48c82a45a0989dbb916e918aaaa3dbae02c1af67b45a10523
422 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1566.002 Spearphishing Attachment

The Excel file contains obfuscated VBA macros, including a Workbook_Open event, which are designed to execute automatically. The macros utilize WScript.Shell and CreateObject to likely download and execute a second-stage payload from the embedded URL http://www.frez.co.uk. The document body provides instructions to enable macros, acting as a lure to bypass security measures.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9d566e375131b1f8f02c7fece7bb4071d8d518960ab22cd4ef84b5b71a78bb30		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2135069 bytes

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